1,008 research outputs found
Esquema de selección de sementales caprinos de aptitud lechera de raza murciano-granadina
Se describe el esquema de selección aprobado para la Asociación Nacional de Criadores de Caprino de Raza Murciano Granadina. El esquema establece una organización piramidal de las ganaderías, clasificándolas en tres estratos: núcleo selectivo, segundo estrato y población no controlada. El desarrollo del mismo consta de tres fases: la primera es común a los dos primeros estratos por desarrollarse exclusivamente a nivel intra-rebaño, consistente en la selección de las madres de candidatos de futuros sementales. La segunda, también intra-rebaño, consiste en la evaluación individual de los candidatos a futuro semental. En la tercera, las ganaderías de segundo estrato realizan una evaluación anual de sus sementales activos y de los nuevos candidatos; mientras que las ganaderías del núcleo selectivo pueden evaluar sus machos a nivel inter-rebaño al encontrarse conectadas genéticamente. Los objetivos selectivos se centran en mejorar la producción lechera, atendiendo a criterios de producción de leche, proteína y grasa en lactaciones de 210 y 240 días, además del morfotipo lechero
Genetic characterisation of the murciano-granadina goat with microsatellites
It have been studied 92 animals of the Murciano-Granadina caprine breed with 22 microsatellites in order to get the genetic characterisation of this Spanish breed. Ovine and bovine microsatellites recommended by FAO, ISAG and other authors in the bibliography have been used. These markers were amplified by mean of the Polymerase Chain Reaction (PCR) technique and to get the size separation of the obtained fragments we have developed electrophoresis in polyacrylamide gel in an automatic sequencer ABI377XL. In future studies the genetic relationships between this breed an others Spanish and Latin-American caprine breeds will be established. The paternity and maternity have been checked with these microsatellites and this has been used to make a paternity panel with 10-12 markers and an a priori exclusion probability higher than 99,9 percent. This panel is useful to check paternity in this emblematic caprine breed from the South of Spain.Se estudian 92 animales pertenecientes a la raza caprina Murciano-Granadina, mediante 22 marcadores microsatélites con objeto de caracterizar esta raza peninsular española. Se han empleado microsatélites recomendados por la FAO, por la ISAG (International Society of Animal Genetics) y por la bibliografía para este tipo de estudios. Los microsatélites se han amplificado mediante la reacción en cadena de la polimerasa (PCR) y los fragmentos amplificados se han separado mediante electroforesis en un secuenciador automático ABI 377XL. En próximos estudios se establecerán las relaciones genéticas de esta raza con otras razas caprinas españolas e iberoamericanas. Se ha llevado a cabo también la comprobación de paternidades y maternidades con estos microsatélites, lo que ha servido para establecer una batería de 10-12 microsatélites con una probabilidad de exclusión a priori superior al 99,9 p.100 que puede resultar muy útil para realizar controles de filiación en esta raza caprina emblemática del sur de España
Morphology of first seven larval stages of the striped soldier shrimp, Plesionika edwardsii (Brandt, 1851) (Crustacea: Decapoda: Pandalidae) from laboratory reared material
With the idea of starting a research program for the biological study of Plesionika edwardsii, eight ovigerous females were collected with artisanal bottom traps at 220 m depth in the Southwest of Gran Canaria island, north-western Africa (27º43.864´N 15º47.822´W), for laboratory larval cultures. The first seven zoeal stages of Plesionika edwardsii were obtained for 20 days after hatching at 23.4 ± 0.4ºC, 10ºC above adult habitat temperature. The zoeal stages are described and illustrated, constituting the first detailed larval description of the genus Plesionika. The larval morphology is compared with previous larval descriptions attributed to Plesionika spp. collected in plankton tows and with descriptions of the first stage of development of Plesionika acanthonotus reared in laboratory
Description of the first five larval stages of Plesionika narval (Fabricius, 1787) (Crustacea, Decapoda, Pandalidae) obtained under laboratory conditions.
The first five zoeal stages of Plesionika narval were obtained from 15 days of laboratory culture. All larval stages are described and illustrated in detail. Zoeal characters are compared with the previous described larvae of Plesionika acanthonotus and Plesionika edwardsii and with undetermined zoeas of Pandalidae from plankton samples
Performance assessment of existing models to predict brittle failure modes of steel-to-timber connections loaded parallel-to-grain with dowel-type fasteners
For safety reasons, ductile failure in timber connections with dowel-type fasteners is always recommended. It has usually been assumed that it can be achieved by fulfilling minimum spacing requirements between fasteners. However, recent works address the need to account for brittle failure modes (namely splitting, row-shear, and block and plug-shear) in connections loaded parallel-to-the-grain in an explicit manner, in order to evaluate them and achieve the desired ductility. This article describes the brittle failure modes and reviews the existing calculation models proposed by several authors – some of them included in standards. Finally, the performance of these models is assessed against an extensive database of tests gathered from the literature following a comprehensive methodology
The baryon vertex with magnetic flux
In this letter we generalise the baryon vertex configuration of AdS/CFT by
adding a suitable instantonic magnetic field on its worldvolume, dissolving
D-string charge. A careful analysis of the configuration shows that there is an
upper bound on the number of dissolved strings. This should be a manifestation
of the stringy exclusion principle. We provide a microscopical description of
this configuration in terms of a dielectric effect for the dissolved strings.Comment: 17 pages, 2 figures. V2: reference added. V3: version to appear in
JHE
UN SERVICIO DE RECOMENDACIONES DE RIEGO PARA EL CULTIVO DE LA FRESA BASADO EN EL PRONÓSTICO METEOROLÓGICO DE LA ETc
[EN] The Institute of Agricultural and Fishery Research and Training (IFAPA in Spanish) is
working to improve the management of water use in the strawberry crop. The objective of
this work is to propose a methodology for estimating strawberry crop water requirements,
which was applicable under growing conditions in the province of Huelva, in Southern Spain.
This paper reports a simple method for performing daily irrigation schedules for strawberry
crop under greenhouse. The method is based on estimating crop evapotranspiration using
estimations of greenhouse reference evapotranspiration (ETo green) and crop coefficients. The
ETo green was estimated, using a model based on solar radiation inside the greenhouse, using
the weekly meteorological forecast provided by the Spanish Meteorology Agency (AEMET in
Spanish). The comparison between estimated values from weather forecasting and those
obtained using meteorological measurements was made weekly, as a quality indicator of
information provided to the farmers.[ES] Dentro de las actividades que el Sistema de Asistencia al Regante (SAR) adscrito al
Instituto de Investigación y Formación Agraria y Pesquera (IFAPA) realiza en el ámbito del
regadío andaluz, se está trabajando para mejorar el uso y gestión del agua en el cultivo de
la fresa. Uno de los objetivos es establecer una metodología para el cálculo de las
necesidades de riego, que sea aplicable en las condiciones de cultivo existentes la provincia
de Huelva. Este trabajo presenta un método sencillo para la realización de calendarios de
riego diarios para el cultivo de la fresa en invernadero del tipo macrotúnel. Dicho método
está basado en la estimación de la evapotranspiración del cultivo utilizando valores de
evapotranspiración de referencia bajo plástico (ETo inv) y coeficientes de cultivo. La ETo inv se
ha estimado aplicando un modelo basado en la radiación solar, utilizando para ello las
predicciones meteorológicas semanales de la Agencia Estatal de Meteorología (AEMET).
Posteriormente, se realiza semanalmente la comparación de los valores estimados a partir
del pronóstico meteorológico con los obtenidos usando de los datos meteorológicos
medidos, como un indicador de la calidad de la información suministrada al agricultor.Gavilán, P.; Bohórquez, J.; Ruiz, J.; Lozano, D. (2015). UN SERVICIO DE RECOMENDACIONES DE RIEGO PARA EL CULTIVO DE LA FRESA BASADO EN EL PRONÓSTICO METEOROLÓGICO DE LA ETc. En XXXIII CONGRESO NACIONAL DE RIEGOS. Valencia 16-18 junio de 2015. Editorial Universitat Politècnica de València. https://doi.org/10.4995/CNRiegos.2015.1508OC
Heavy quark symmetry constraints on semileptonic form factors and decay widths of doubly heavy baryons
We show how heavy quark symmetry constraints on doubly heavy baryon
semileptonic decay widths can be used to test the validity of different quark
model calculations. The large discrepancies in the results observed between
different quark model approaches can be understood in terms of a severe
violation of heavy quark spin symmetry constraints by some of those models.Comment: 10 LaTex pages, 3 figures, 6 tables. Corrected and enlarged versio
- …